<?php   
//export.php   
$connect = mysqli_connect("localhost", "root", "", "testing"); 
$output = ''; 
if(isset($_POST["export"])) 
{ 
 $query = "SELECT * FROM tbl_customer"; 
 $result = mysqli_query($connect, $query); 
 if(mysqli_num_rows($result) > 0) 
 { 
  $output .= ' 
   <table class="table" bordered="1">   
                    <tr>   
                         <th>Name</th>   
                         <th>Address</th>   
                         <th>City</th>   
       <th>Postal Code</th> 
       <th>Country</th> 
                    </tr> 
  '; 
  while($row = mysqli_fetch_array($result)) 
  { 
   $output .= ' 
    <tr>   
                         <td>'.$row["CustomerName"].'</td>   
                         <td>'.$row["Address"].'</td>   
                         <td>'.$row["City"].'</td>   
       <td>'.$row["PostalCode"].'</td>   
       <td>'.$row["Country"].'</td> 
                    </tr> 
   '; 
  } 
  $output .= '</table>'; 
  header('Content-Type: application/xls'); 
  header('Content-Disposition: attachment; filename=download.xls'); 
  echo $output; 
 } 
} 
?> 
 
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